package com.hmall.gateway.filters;

import cn.hutool.core.collection.CollUtil;
import com.hmall.common.exception.UnauthorizedException;
import com.hmall.common.utils.CollUtils;
import com.hmall.gateway.config.AuthProperties;
import com.hmall.gateway.utils.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
@RequiredArgsConstructor
@EnableConfigurationProperties(AuthProperties.class)
public class AuthGlobaFilter implements GlobalFilter, Ordered {

	private final AuthProperties authProperties;

	private final JwtTool jwtTool;

	private final AntPathMatcher antPathMatcher = new AntPathMatcher();
	@Override
	public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
		ServerHttpRequest request = exchange.getRequest();

		if (isExclude(request.getPath().toString())){
			return chain.filter(exchange);
		}
		String token = null;
		List<String> headers = request.getHeaders().get("authorization");

		if (headers != null && !headers.isEmpty()){
			token = headers.get(0);
		}
		Long userId = null;
		try {
			 userId = jwtTool.parseToken(token);
		}catch(UnauthorizedException e){
			ServerHttpResponse response = exchange.getResponse();
			response.setStatusCode(HttpStatus.UNAUTHORIZED);
			return response.setComplete();
		}
		String userInfo = userId.toString();

		ServerWebExchange swe = exchange.mutate()
				.request(builder -> builder.header("user-info", userInfo))
				.build();
		return chain.filter(swe);
	}

	private boolean isExclude(String path) {
		for (String pathPattern : authProperties.getExcludePaths()) {
			if(antPathMatcher.match(pathPattern ,path)){
				return true;
			}
		}
		return false;
	}

	@Override
	public int getOrder() {
		return 0;
	}
}
